As other people have said, I have the Two Brothers and without a silencer it's seriously loud. Loud to the point that I pull the clutch to coast past cops and cut the engine and coast into my building so I don't piss people off.

That being said, it's all a matter of opinion. I happen to prefer the look of the Two Brothers over the Leo. Now if you were comparing the Two Brothers to the Yoshimura RS-5 carbon that would be a different story.

I took the Leo off my bike when i got it and installed a Two bros ;)... Two brothers is deeper sounding than the Leo, the leo sounded like a high pitched Honda civic with an Advance auto parts fat can on it..

"For me, the problem is that big part of MotoGP riders now are pussies,"Rossi declared. "In the past, this is normal, the riders were more like real men. Now it is more like they are children."http://www.youtube.com/user/bobbybrown3022